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Quick update -- I opened the union but was not able to get that thing that looks like a threaded coupling to budge. I used a large pipe wrench and what I think was quite a lot of torque. I was a little afraid of breaking something so I gave up and reassembled. The air bubbles have stopped, so...

Thanks everyone! JasonLion, you're giving me hope that's a threaded coupling. I hadn't noticed that. The left side looks glued so maybe it's only threaded on the right. Not sure why they would have done that, but if it comes apart, that sure makes things easier. I'll have to try that...

I know now that the test strips aren't a good idea. I'm just providing another reason to get a good test kit.

I've got a slow leak on the suction side of my pump. I'm pretty sure a cracked union nut has something to do with it. There's some flex stress on the plastic due to settling. I'm not sure I'd have enough room to make a repair with a similar union. See the photo. I'd appreciate any advice...

Old test strip, dated 2012 (on the left), and new test strip dated 2015 dipped together. The bottle matches the new test strip. Note especially how far off the Free Chlorine and CYA measurements are. Yikes.

OK, thanks everyone! It's unanimous. Enough with the Polaris repairs. Time to shop for a new type of robot. I will look back through this forum for product recommendations. Thanks a lot for all the input.

I'd welcome some advice on my situation on my 20x40' in-ground vinyl pool. We have a ~20-year old Polaris 280 that keeps the pool clean. We've detected a major water leak in the underground pressure line. I had the same line repaired twice about 4 years ago for about $2000. The repair...

I have seen that problem on my timer. I am not certain what caused it, but I suspect it was due to using tripper pins that are almost but not exactly the correct size. Did you recently replace or add these trippers?